North Carolina Floodplain Mapping Program, North Carolina Division of Emergency Management
201008
MAPXSLN
vector digital data
MAPXSLN
withheld
MAPXSLN is a linear feature class containing information about Cross Section lines. These lines represent the locations of channel surveys performed for input into the hydraulic model used to calculate flood elevations. These locations are also shown on the flood profiles in the Flood Insurance Study report and can be used to cross reference the flood profiles to the planimetric depiction of the flood hazard.
These data were collected and derived by the North Carolina Floodplain Mapping Program (www.ncfloodmaps.com) as part of its effort to modernize FEMA Flood Insurance Rate Maps (FIRM) statewide. The North Carolina Floodplain Mapping Program was established through a Cooperating Technical State (CTS) agreement with FEMA in response to the extensive damage caused by Hurricane Floyd in 1999.
en
201008
publication date
As needed
-78.257418
-77.697237
36.204048
35.723576
2220393.552083
2384393.000651
720786.447917
894008.770833
None
Cross Sections
North Carolina Atlas & Gazetteer (Yarmouth, Maine: DeLorme, 2001).
North Carolina
None
These data were created with the highest consideration of accuracy and data integrity. However, as with all other geospatial datasets, users must take into consideration the consequences of using the data for specific applications, business processes, decisions, and map display. For example, surface conditions may have changed in some areas since the initial data was captured. A full metadata record is provided to help the user understand the date, map scale and accuracy standard applied in the collection and data development process. The data should not be used without full review and comprehension of the metadata. Acknowledgement of the North Carolina Floodplain Mapping Program is appreciated when using the data set. Data further derived from this data set should be fully documented using the federal metadata standard and listed via the NC Geospatial Data Clearinghouse.
North Carolina Floodplain Mapping Program, NC DEM
John Dorman
Director
physical address
1812 Tillery Place, Suite 105
Raleigh
NC
27604
919-715-5711
919-715-0408
ESRI ArcCatalog 9.3.1.1850
Federal Emergency Management Agency
Unknown
Unknown
Flood Insurance Study, ALL COUNTIES, NC
document
Washington, DC
FEMA
withheld
Federal Emergency Management Agency
Unknown
Unknown
Flood Insurance Study, ALL COUNTIES, NC
raster digital data
Washington, DC
FEMA
withheld
Federal Emergency Management Agency
Unknown
Unknown
Flood Insurance Study, ALL COUNTIES, NC
map
withheld
Personal GeoDatabase Feature Class
None
None
North Carolina Floodplain Mapping Program
Unknown
MapXsLn
Feature class
unknown
publication date
STUDY4
For the streams studied by detailed methods, the cross section geometries were obtained from a combination of digital elevation data obtained using Light Detection and Ranging (LIDAR) data and field surveys. All bridges, dams, and culverts were field surveyed to obtain elevation data and structural geometry. Natural floodplain cross sections were surveyed approximately every 4000? along the detail study reaches to obtain the channel geometry between bridges and culverts. Overbank cross-section data for the backwater analyses were obtained from recently flown LIDAR data.
Cross sections for the flooding sources studied by limited detailed methods were obtained using digital elevation data obtained with LIDAR technology developed as part of the North Carolina Statewide Floodplain Mapping Program. The hydraulic model is prepared using this digital elevation data, without surveying bathymetric or structural data. Where bridge or culvert data are readily available, such as from the North Carolina Department of Transportation, these data have been reflected in the hydraulic model. If these structural data are not readily available, field measurements of these structures were made to approximate their geometry in the hydraulic models. In addition, this method does not include field surveys that determine specifics on channel and floodplain characteristics.
For redelineated streams in the county, cross sections were digitized from previously effective FIRMs or Floodway map panels.
For the streams studied by detailed methods, the cross section geometries were obtained from a combination of digital elevation data obtained using Light Detection and Ranging (LIDAR) data and field surveys. All bridges, dams, and culverts were field surveyed to obtain elevation data and structural geometry. Natural floodplain cross sections were surveyed approximately every 4000? along the detail study reaches to obtain the channel geometry between bridges and culverts. Overbank cross-section data for the backwater analyses were obtained from recently flown LIDAR data.
Cross sections for the flooding sources studied by limited detailed methods were obtained using digital elevation data obtained with LIDAR technology developed as part of the North Carolina Statewide Floodplain Mapping Program. The hydraulic model is prepared using this digital elevation data, without surveying bathymetric or structural data. Where bridge or culvert data are readily available, such as from the North Carolina Department of Transportation, these data have been reflected in the hydraulic model. If these structural data are not readily available, field measurements of these structures were made to approximate their geometry in the hydraulic models. In addition, this method does not include field surveys that determine specifics on channel and floodplain characteristics.
For redelineated streams in the county, cross sections were digitized from previously effective FIRMs or Floodway map panels.
Unknown
Vector
Simple
FALSE
9160
TRUE
FALSE
coordinate pair
0.000651
0.000651
survey feet
North American Datum of 1983
Geodetic Reference System 80
6378137.000000
298.257222
GCS_North_American_1983
NAD_1983_StatePlane_North_Carolina_FIPS_3200_Feet
0.000003
Explicit elevation coordinate included with horizontal coordinates
CROSS_SECTIONS_2014
Cross Section Lines
Geodatabase Design (State of North Carolina, North Carolina Floodplain Mapping Program, 2008)
Feature Class
9160
Shape
Feature geometry.
ESRI
Sequential unique whole numbers that are automatically generated.
EFFSTAT
String
5
0
0
EFFSTAT
Is the x-section part of an effective study or preliminary study?
Geodatabase Design (State of North Carolina, North Carolina Floodplain Mapping Program, 2008)
Sequential unique whole numbers that are automatically generated.
MAPXSLNID
String
25
0
0
MAPXSLNID
Primary key. Defined by mapping contractor using the formula STFIPS + COFIPS + DATE + SEQUENTIAL NUMBER (where date = YYYYMMDD)
Geodatabase Design (State of North Carolina, North Carolina Floodplain Mapping Program, 2008)
Sequential unique whole numbers that are automatically generated.
XSECTID
String
25
0
0
XSECTID
Foreign key to S_HYDRACROSSSECTION
Geodatabase Design (State of North Carolina, North Carolina Floodplain Mapping Program, 2008)
Sequential unique whole numbers that are automatically generated.
WTR_NM_LID
String
25
0
0
WTR_NM_LID
Water name lookup identification. A code that provides a link to the name of the water feature in the MAPLWTRNM table.
Geodatabase Design (State of North Carolina, North Carolina Floodplain Mapping Program, 2008)
Sequential unique whole numbers that are automatically generated.
REFPTID
String
25
0
0
REFPTID
Foreign key to S_REFPOINT
Geodatabase Design (State of North Carolina, North Carolina Floodplain Mapping Program, 2008)
Sequential unique whole numbers that are automatically generated.
XS_LTR
String
12
0
0
XS_LTR
Cross section letter or number shown on FIRM
Geodatabase Design (State of North Carolina, North Carolina Floodplain Mapping Program, 2008)
Sequential unique whole numbers that are automatically generated.
STREAM_STN
Double
8
38
8
STREAM_STN
Distance along stream
Geodatabase Design (State of North Carolina, North Carolina Floodplain Mapping Program, 2008)
Sequential unique whole numbers that are automatically generated.
XS_LN_TYP
String
5
0
0
XS_LN_TYP
Cross section line type
Geodatabase Design (State of North Carolina, North Carolina Floodplain Mapping Program, 2008)
Sequential unique whole numbers that are automatically generated.
LEN_LID
String
5
0
0
LEN_LID
Units of linear measure
Geodatabase Design (State of North Carolina, North Carolina Floodplain Mapping Program, 2008)
Sequential unique whole numbers that are automatically generated.
V_DATM_LID
String
5
0
0
V_DATM_LID
Vertical Datum lookup identification
Geodatabase Design (State of North Carolina, North Carolina Floodplain Mapping Program, 2008)
Sequential unique whole numbers that are automatically generated.
AREA_LID
String
5
0
0
AREA_LID
Units of area measure. A code that provides a link to an entry from D_AREA_UNITS
Geodatabase Design (State of North Carolina, North Carolina Floodplain Mapping Program, 2008)
Sequential unique whole numbers that are automatically generated.
VEL_LID
String
5
0
0
VEL_LID
Velocity Lookup Identification. This unit specifies the unit of measurement for the velocity of the floodway
Geodatabase Design (State of North Carolina, North Carolina Floodplain Mapping Program, 2008)
Sequential unique whole numbers that are automatically generated.
BED_ELEV
Double
8
38
8
BED_ELEV
Streambed elevation. The elevation of the streambed at this cross section as shown on the flood profile in the FIS
Geodatabase Design (State of North Carolina, North Carolina Floodplain Mapping Program, 2008)
Sequential unique whole numbers that are automatically generated.
TOP_WIDTH
Double
8
38
8
TOP_WIDTH
Width of the floodway at this cross section as shown in the Floodway data table in the FIS
Geodatabase Design (State of North Carolina, North Carolina Floodplain Mapping Program, 2008)
Sequential unique whole numbers that are automatically generated.
VELOCITY
Double
8
38
8
VELOCITY
The mean velocity of the floodway at this cross section as shown in the Floodway data table in the FIS
Geodatabase Design (State of North Carolina, North Carolina Floodplain Mapping Program, 2008)
Sequential unique whole numbers that are automatically generated.
WSEL_REG
Double
8
38
8
WSEL_REG
100-year water surface elevation
Geodatabase Design (State of North Carolina, North Carolina Floodplain Mapping Program, 2008)
Sequential unique whole numbers that are automatically generated.
XS_AREA
Double
8
38
8
XS_AREA
Underwater cross section area used in floodway data table.
Geodatabase Design (State of North Carolina, North Carolina Floodplain Mapping Program, 2008)
Sequential unique whole numbers that are automatically generated.
METAID
String
25
0
0
METAID
Foreign key to METADATA
Geodatabase Design (State of North Carolina, North Carolina Floodplain Mapping Program, 2008)
Sequential unique whole numbers that are automatically generated.
OBJECTID
OID
4
10
0
OBJECTID
Internal feature number.
ESRI
Sequential unique whole numbers that are automatically generated.
Shape
Geometry
4
0
0
SHAPE
Feature geometry.
ESRI
Coordinates defining the features.
GlobalID
GlobalID
38
0
0
Shape.STLength()
Shape.STLength()
Double
0
0
0
North Carolina Floodplain Mapping Program
Hope Morgan
GIS Manager
mailing and physical address
1830-B Tillery Place
Raleigh
NC
27604
USA
919-715-5711
hmorgan@ncem.org
8:30 AM to 5:30 PM EST
Downloadable Data
Although every effort has been made to ensure the accuracy of information, errors and conditions originating from physical sources used to develop the corporate database may be reflected in the data supplied. The client must be aware of data conditions and bear responsibility for the appropriate use of the information with respect to possible errors, original map scale, collection methodology, currency of data, and other conditions specific to certain data. NCFMP does not support secondary distribution of this data. The use of trade names or commercial products does not constitute their endorsement by the NCFMP or North Carolina State Government.
ASCII
line dataset and metadata
PC-based PKZip compatible products (WinZip, unzip) may be used to decompress the dataset.
2.0-4.0 MB
withheld
Custom data creation and analysis work is available by contract. Contact Production Services at (919) 733-2090.
Data are supplied in ArcInfo and ASCII formats. Format compatibility is the user's responsibility.
unknown
20100808
North Carolina Floodplain Mapping Program
Hope Morgan
GIS Manager
mailing and physical address
1830-B Tillery Place
Raleigh
NC
27604
919-715-5711
hmorgan@ncem.org
FGDC Content Standards for Digital Geospatial Metadata
FGDC-STD-001-1998
local time
http://www.esri.com/metadata/esriprof80.html
ESRI Metadata Profile
en
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20100808
09391300
FALSE
20220107
13365400
20220107
13365400
CROSS_SECTIONS_2014
002
1448975.967441
1618403.984387
390099.803289
533172.276060
1
Projected
GCS_North_American_1983
Linear Unit: Foot_US (0.304801)
NAD_1983_StatePlane_North_Carolina_FIPS_3200_Feet
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CROSS_SECTIONS_2014
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2384393.000651
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36.204048
35.723576
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ISO 19115 Geographic Information - Metadata
DIS_ESRI1.0
dataset
002
withheld
Local Area Network
Personal GeoDatabase Feature Class
Feature Class
NAD_1983_StatePlane_North_Carolina_FIPS_3200_Feet
EPSG
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9160
20220107